Community find

Fairy Ring Mushroom

Marasmius oreades

Group

gilled mushroom

Season

Spring, summer, and fall, particularly after rainfall.

Habitat

Typically found in grassy areas such as lawns, meadows, pastures, and along roadsides. It often grows in distinct arcs or rings, known as "fairy rings". It favors disturbed ground.

Key characteristics

Cap: 1-5 cm wide, bell-shaped to convex, flattening with age, sometimes with a central umbo; smooth, dry, and often rugulose (wrinkled) when dry. Color ranges from buff to tan or reddish-brown, fading when dry (hygrophanous). Gills: Free to adnate, widely spaced, and pale cream to buff. Stems: 2-10 cm long, slender, tough, cartilaginous, often twisted, and colored similarly to the cap, sometimes paler.

Look-alikes

There are several similar-looking species. 'Melanoleuca cognata' has more crowded gills and grows in different habitats. Some 'Clitocybe' species can appear similar but often have decurrent gills and a different odor. Care must be taken to distinguish it from species like 'Galerina marginata', which is a deadly poisonous mushroom; 'M. oreades' can be distinguished by its tough, flexible stem, widely spaced gills, and growth habit.

Ecological role

Saprotrophic, decomposing organic matter in soil and contributing to nutrient cycling in grassy ecosystems. Its ability to form fairy rings indicates its extensive mycelial network in the soil.